Re: Smoke detectors expiry dates. › Flat Chat Strata Forum › Smoke gets in your eyes › Smoke detectors expiry dates. › Current Page 12/12/2016 at 8:40 pm #25997 MarvinFlatchatter @Susanp said: I read that at May 2016 new legislation now require that smoke detector units have to be fully replaced within every 10 years after its expiry date? I’m not aware of any legislation in NSW that requires a replacement after 10 years.